Environment-friendly wide-temperature aluminum alloy anodic oxidation electrolyte and preparation method and application thereof

Anodizing, aluminum alloy technology, applied in anodizing, electrolytic coating, surface reaction electrolytic coating, etc., can solve the problem of acid-base imbalance, reduce field-assisted dissolution effect, hidden safety hazards, etc., to improve surface mechanical properties, widen Anodizing temperature, reducing the effect of surface pulverization

Active Publication Date: 2022-02-08
FOSHAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, for wide temperature aluminum alloy oxidation, mainly by adding oxalic acid and other organic acids containing carboxylic acid in the sulfuric acid electrolyte, oxalic acid is adsorbed on the aluminum alloy during anodic oxidation surface, and the weakly acidic electrolyte reduces the field-assisted dissolution effect, making it possible to form a denser anodic oxide film at a higher temperature, thereby broadening the anodic oxidation temperature, but oxalic acid is a volatile acid, and it is Volatile toxic acid mist is easy to form in the medium. After being ingested by the human body, it will cause an acid-base imbalance in the body and affect the metabolic balance of the human body.

Method used

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  • Environment-friendly wide-temperature aluminum alloy anodic oxidation electrolyte and preparation method and application thereof
  • Environment-friendly wide-temperature aluminum alloy anodic oxidation electrolyte and preparation method and application thereof

Examples

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Embodiment 1

[0047] An aluminum alloy anodic oxidation electrolyte, containing sulfuric acid, triethanolamine, ethanol and cerium nitrate in the electrolyte, wherein: the mass concentration of sulfuric acid is 100g / L, the mass concentration of triethanolamine is 15g / L, and the mass concentration of ethanol is 25g / L, the molar concentration of cerium nitrate is 0.05mol / L.

[0048] A method for preparing an aluminum alloy anodic oxidation electrolyte, comprising the following steps:

[0049] Dissolving triethanolamine in the ethanol solution, and magnetic stirring for 5 minutes, to obtain a triethanolamine solution;

[0050] Slowly add 98wt.% concentrated sulfuric acid into distilled water to dilute into 100g / L dilute sulfuric acid solution, and cool the dilute sulfuric acid solution to room temperature;

[0051] Add the triethanolamine solution into the dilute sulfuric acid solution, then add cerium nitrate, and stir for 5 minutes to obtain the aluminum alloy anodic oxidation electrolyte ...

Embodiment 2

[0058] An aluminum alloy anodic oxidation electrolyte, containing sulfuric acid, triethanolamine, ethanol and cerium nitrate in the electrolyte, wherein: the mass concentration of sulfuric acid is 110g / L, the mass concentration of triethanolamine is 20g / L, and the mass concentration of ethanol is 30g / L, the molar concentration of cerium nitrate is 0.06mol / L.

[0059] A method for preparing an aluminum alloy anodic oxidation electrolyte, comprising the following steps:

[0060] Dissolving triethanolamine in the ethanol solution, and magnetic stirring for 8 minutes, to obtain a triethanolamine solution;

[0061] Slowly add 98wt.% concentrated sulfuric acid into distilled water to dilute to 110g / L dilute sulfuric acid solution, and cool the dilute sulfuric acid solution to room temperature;

[0062] Add the triethanolamine solution into the dilute sulfuric acid solution, then add cerium nitrate, and stir for 10 minutes to obtain the aluminum alloy anodic oxidation electrolyte o...

Embodiment 3

[0069] An aluminum alloy anodic oxidation electrolyte, containing sulfuric acid, triethanolamine, ethanol and cerium nitrate in the electrolyte, wherein: the mass concentration of sulfuric acid is 120g / L, the mass concentration of triethanolamine is 23g / L, and the mass concentration of ethanol is 33g / L, the molar concentration of cerium nitrate is 0.07mol / L.

[0070] A method for preparing an aluminum alloy anodic oxidation electrolyte, comprising the following steps:

[0071] Dissolving triethanolamine in the ethanol solution, and magnetic stirring for 10 minutes, to obtain a triethanolamine solution;

[0072] Slowly add 98wt.% concentrated sulfuric acid into distilled water to dilute to 120g / L dilute sulfuric acid solution, and cool the dilute sulfuric acid solution to room temperature;

[0073] Add the triethanolamine solution into the dilute sulfuric acid solution, then add cerium nitrate, and stir for 5 minutes to obtain the aluminum alloy anodic oxidation electrolyte o...

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Abstract

The invention belongs to the technical field of metal surface machining, and particularly discloses an environment-friendly wide-temperature aluminum alloy anodic oxidation electrolyte and a preparation method and application thereof. The aluminum alloy anodic oxidation electrolyte comprises an organic complexing agent and rare metal salt. The organic complexing agent comprises an alcohol amine compound; the rare metal salt comprises cerium salt; the aluminum alloy anodic oxidation electrolyte is prepared by mixing all the raw materials. When the aluminum alloy anodic oxidation electrolyte is used for anodizing aluminum alloy, high anodic oxidation current density can be adopted; anodic oxidation is completed within a short anodic oxidation time, an anodic oxidation film layer with excellent mechanical properties and corrosion resistance can still be formed within a wide temperature range of 20-40 DEG C, the critical load is 10.13-15.71 N, the wear rate is 5.4*10<-5>-9.52*10<-3> mm/Nm, and the oxidation film resistance is 7.8*10<4>-5.5*10<5> omega.cm<2>.

Description

technical field [0001] The invention relates to the technical field of metal surface processing, in particular to an environment-friendly and wide-temperature aluminum alloy anodic oxidation electrolyte and a preparation method and application thereof. Background technique [0002] Aluminum alloy is the most widely used non-ferrous metal material in the world, and anodic oxidation is one of the important technical means for surface treatment of aluminum alloy. The anodic oxidation in the sulfuric acid electrolyte system often presents many advantages such as solution stability, high film-forming efficiency, good film-forming performance and low cost. Therefore, this electrolyte system is also widely used in the industry for the surface of aluminum alloys. deal with. [0003] The temperature of the electrolyte in the anodic oxidation process is one of the key factors affecting the quality of the oxide film (surface mechanical properties and corrosion resistance). In the ano...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/08C25D11/16
CPCC25D11/08C25D11/16Y02P10/20
Inventor 陈东初李金贵魏红阳陈旻马骥黄银纯
Owner FOSHAN UNIVERSITY
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